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Intact Nanoparticulate Indomethacin in Fast-Dissolving Carrier Particles by Combined Wet Milling and Aerosol Flow Reactor Methods

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)2403-2411
Number of pages9
JournalPharmaceutical Research
Issue number10
Publication statusPublished - 2011
Publication typeA1 Journal article-refereed


Drug development is often hindered by a drug's low dissolution rate. We present a method to increase dissolution rate of a drug powder by producing crystalline nanoparticles that are dispersed in carrier microparticles.
Indomethacin crystals of a few hundred nanometers are prepared by media milling using poloxamer 188 as a stabilizer. Nanoparticles are embedded into microparticles with a mannitol matrix and an L-leucine coating layer using an aerosol flow reactor method.
Microparticles stabilize the primary nanoparticles in an intact crystalline form and release them when re-dispersed in aqueous medium. Secondary microparticle structure dissolves rapidly, resulting in a fast release and dissolution of indomethacin. In this manner, it is possible to change the surface layer of the particles from the one needed for nanoparticle production to one more suitable for process formulation of pharmaceuticals for, e.g., tablet or pulmonary products.
Particle assemblies where nano-sized crystalline drug domains are embedded in solid microparticles are presented. The present work is a promising approach towards a ?nanos-in-micros? concept as a tool for pharmaceutical nanoparticle processing.


  • aerosol flow reactor, drug dissolution, media milling, microparticles, nanoparticles, L-LEUCINE, SALBUTAMOL SULFATE, GAS-PHASE, DELIVERY, BEHAVIOR, POWDERS, 317 Pharmacy